Online Library and Publication Platform | OAPEN(主要是欧洲学术电子书)
Easy and fast book searcher, create and search your private library.
PDF Drive - Search and download PDF files for free.
没啥用,搜的内容杂乱,多数...
Find Free eBooks(基本不用)
英文ePub
适合大众的ePub电子书
聚合文档搜索导航
通过校园网访问使用